question_answer

The mirror formula is given by,\[\frac{1}{\upsilon }+\frac{1}{u}=\frac{1}{f}\] Where the symbols have their usual meanings. Then the lens formula is given by

A)  \[\frac{1}{\upsilon }+\frac{1}{u}=\frac{1}{f}\]   

B)         \[\frac{1}{\upsilon }-\frac{1}{u}=\frac{1}{f}\]  

C)  \[\frac{1}{\upsilon }+\frac{1}{u}=-\frac{1}{f}\]  

D)         none of these